岩体结构影响下覆岩冒落及地表岩移特征研究

Study on characteristics of overlying rock caving and surface rock movement affected by rock mass structure

采用数值方法对岩体结构影响下覆岩冒落及地表岩移特征进行了研究.采矿过程中,覆岩冒落呈现缓慢-快速周期性发展;地表岩移发展主要由急倾斜节理控制,总体上以横向扩展为主;开采区域内岩移发展受断层的影响大于节理的影响,断层倾角的减小将增加其上盘岩体的弱化效应,可能导致岩体发生倾倒破坏,增加地表岩移范围.

Numerical methods were used to study the characteristics of overlying rock caving and surface rock movement affected by rock mass structure.During the mining process,overlying rock caving shows slow-fast cyclical development.The development of surface rock movement is mainly controlled by steeply inclined joints,and the development of rock movement is mainly horizontal expansion.The development of rock movement in the mining area is more affected by the fault than joints.The decrease of the fault dip will increase the weakening effect of the hanging wall rock mass,which may cause the dumping destruction of the hanging wall rock mass and increase the range of surface rock movement.